JP3043277B2 - Powder molding press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder molding press for pressing a metal powder or the like filled in a cavity into a predetermined shape by pressing.

[0002]

2. Description of the Related Art As a powder pressing press of a double pressing method,
A compression cam, a lifting prevention cam and an extrusion cam are attached to the main shaft, and an extrusion screw is attached to the die plate.During the pressurization process, the compression cam lowers the die plate via the compression rod, and the upper punch is applied. When the pressure is completed and the pressure rises, the lifting prevention cylinder acts by the lifting prevention cam to prevent the floating of the float plate with the lifting prevention rod. Press down to release the lower ram, lower the die plate together with the lower ram, release the float plate with the extrusion screw, lower the float plate, and push out the molded product from the cavity. An object is known (Japanese Patent Publication No. 42598/1990).

[0003]

The above-mentioned conventional powder molding press requires three types of cams (compression cam, floating prevention cam, and extrusion cam) having different shapes from each other, and the structure becomes complicated and the cost increases. I am dissatisfied.

Further, in order to release the stop of the float plate in the extrusion process, the extrusion screw must be lowered together with the die plate for a predetermined stroke or more, so that there is a restriction in forming a flange of a molded product and the like. However, there is a problem that it cannot be formed into a thin shape.

[0005]

According to a first aspect of the present invention, there is provided a powder molding press, comprising: an upper punch attached to an upper ram which is moved up and down by rotation of a spindle; A die plate provided with a die inserted from above to below and provided vertically below the upper punch, and a first punch inserted into the die from below from above and provided vertically freely below the die plate. A float plate, a base plate provided by fixing a second punch to the first punch from below and fixed to a frame below the float plate, and a core rod are inserted into the second punch from below. A pressing rod having a lower ram connected to the die plate below the base plate, wherein the pushing rod is vertically movable in the axial direction; A pressing cylinder that presses the float plate downward with a pressing portion by lowering a rod, and a floating cylinder that rotates together with the main shaft and lowers the push rod so that the upper punch completes pressurization and rises when the upper punch is lifted. And a cam for preventing the plate from floating.

A slide block which comes into contact with a stopper to stop the float plate at a pressure completion position, and a wedge which is pushed down by an extrusion rod to lower the float block from the stopper to lower the float plate; Can be provided. In this case, the base plate may be provided with a stop member for bringing the pressing portion of the pressing cylinder into contact with the stopper almost at the same time when the slide block contacts the stopper.

In addition, a stopper is provided on the lower ram to stop the lower ram at the position where the pressurization is completed by contacting the fixing member. An additional configuration can be adopted. Furthermore,
The push rod may be provided with a cushion cylinder that pushes down the lower ram at the pressing portion by the downward movement of the push rod during pressurization.

[0008] The pressing portion of the cushion cylinder is brought into contact with the frame almost at the same time when the stopper comes into contact with the fixing member,
A configuration in which a stopper member for directly lowering the lower ram by the push rod can be provided.

Also, a die plate provided with an upper punch attached to an upper ram which is moved up and down by rotation of a main shaft, and a die into which the upper punch is inserted from above to below, is provided vertically below the upper punch so as to be vertically movable. A first punch is fitted into the die from below, and a float plate is provided vertically below the die plate so as to be freely movable.
A base plate fixedly mounted on the frame below the float plate by being inserted into the punch from below,
A cam that rotates together with the main shaft, in a powder molding press having a lower ram provided with a core rod inserted into the second punch from below and connected to the die plate below the base plate; And a push rod that lowers the float plate and the lower ram by releasing the float plate and the lower ram when pressurization is completed, and lowers the float plate when the pressurization is completed. Can be.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to FIGS. In the figure, reference numeral 1
(FIG. 1) is a main shaft. The main shaft 1 is horizontally supported on an upper portion of a frame 2, and is rotated by an electric motor 3.

An upper ram 5 and a lower ram (yoke plate) 6 are provided on the upper and lower portions of the frame 2, respectively. The upper ram 5 is connected to a crank mechanism 7 operated by rotation of the main shaft 1, and the lower ram 6 is supported by a pair of filling cylinders 8,8. Upper ram 5 and lower ram 6
Is up and down freely. An upper punch 9 is attached to a lower end of the upper ram 5 via an upper punch plate 10 and the like.
A die plate 12, a float plate 13, and a base plate 14 are provided between the upper punch 9 and the lower ram 6.
Are arranged in the above order from top to bottom.

The die plate 12 includes a die 16 (FIGS. 3, 4, and 5) into which the upper punch 9 is inserted from above to below.
The lower ram 6 is fixed by a plurality of (generally four) coupling members (not shown), and is configured to move up and down together with the lower ram 6.

The float plate 13 is provided with a die 16
Punch 18 and pressure receiving rod 1 inserted from bottom to top
9, a slide block 20 and a wedge 21, and a pair of cylinders 22, 22 on the base plate 14 (FIG. 6).
Only one is shown. ) Is supported up and down freely.

The first punch 18 is fixed to a fixed plate 23, and the fixed plate 23 is attached to an adjusting member 25 screwed into a nut member 24 (FIGS. 3 and 7) with an attaching member 26. The rotation of the adjustment member 25 is stopped by the key 27,
When the nut member 24 is rotated by the worm 28, the nut member 24 moves upward or downward to change the insertion depth of the first punch 18 into the die 16. The slide block 20
This is to stop the float plate 13 at the pressure completion position by contacting the stopper 30 provided on the base plate 14, and when the wedge 21 descends, the roller 29 is pushed sideways, moves outward, and is removed from the stopper 30. So as to be slidable left and right on the lower surface of the float plate 13.

Further, the base plate 14 is provided with a second punch 32 which is fitted into the first punch 18 from below and fixed to the frame 2. The second punch 32 is fixed to a fixed plate 33, and the fixed plate 33 is attached to the base plate 14 by an attachment member 34. Base plate 14
, A stop member 35 is fixed by a plurality of connecting members 36 (FIG. 6). Pressure receiving rod 19 and wedge 21
Is inserted through the shaft hole of the stop member 35.

The lower ram 6 is provided with a core rod 37 and a stopper 38 (FIG. 1). The upper end of the core rod 37 is inserted into the second punch 32 from below. The stopper 38 comes into contact with the fixing member 39 to stop the lower ram 6 at the pressure completion position, and is attached to the lower ram 6 so as to be rotatable up and down by a pivot 40. The fixing member 39 has a screw structure and can be adjusted up and down.

Upper ram 5, Lower ram 6, Die plate 1
2. The basic structures of the float plate 13, the base plate 14, and the like are well known.

Reference numeral 51 (FIG. 1) denotes a cam. The cams 51 are fixed to the main shaft 1 and provided on the left and right sides of the crank mechanism 7, respectively. Below each cam 51, a push rod 52 (FIGS. 1, 2, and 3) is supported by the frame 2 and is provided vertically vertically in the axial direction. The push rod 52 has a roller 53 (FIG. 1), a bracket 54 and a flange 55.

The roller 53 receives the pressure of the cam 51, and is rotatably attached to the upper end of the push rod 52. When the upper punch 9 completes pressurization and rises, the bracket 54 presses the pressing portion 57 of the pressing cylinder 57.
a, the pressure receiving rod 19 is pushed down to float plate 13
The slide block 20 is removed from the stopper 30 at an appropriate time after the floating is prevented by pushing the wedge 21 downward with the adjusting screw (push portion) 58, and the float plate 13 is removed from the step 21a of the wedge 21. And is lowered at the center of the push rod 52. The adjustment screw 58 is vertically adjustable with respect to the bracket 54.

The pressing portion 57a of the pressing cylinder 57
Is set so that the slide block 20 contacts the stopper 30 in a state where the slide block 20 contacts the stopper 30 and the float plate 13 stops descending.

The flange 55 is fixed to the push rod 52 below the bracket 54. Flange 5
A lower end of an ascending spring 59 (FIG. 2) having an upper end attached to the frame 2 is attached to the upper surface of the push rod 5 to urge the push rod 52 upward. On the lower surface of the flange 55, cushion cylinders 63, 63 in which a cylindrical member (pressing portion) 62 is screwed into a screw plate 61 are supported. Tubular member 62
Is vertically fitted to the push rod 52 and is vertically adjustable with respect to the screw plate 61.

The cylindrical member 62 is lowered together with the flange 55 and the like by the push rod 52, and after the upper punch 9 is slightly inserted into the die 16 and the preliminary pressurization is started, the pressure receiving rod 64 (FIG. 2) ) To lower the die plate 12 and the core rod 37 together with the lower ram 6. The pressure receiving rod 64 is provided on the lower ram 6 so as to be vertically adjustable.

The frame 2 has a stopper member 65.
(FIG. 1) is provided, and the stopper 38 is fixed to a fixing member 39.
When the cylindrical member 62 is in contact with the cylindrical member 62, the cylindrical member 62 is brought into contact with the cylindrical member 62 to stop the downward movement.

A lever (release means) 66 is attached to the lower end of the right push rod 52 in FIG. The lever 66 is lowered by the push rod 52 to rotate the stopper 38, and at an appropriate time after the pressurization is completed, the stopper 38 is removed from the fixing member 39 and the lower ram 6 is removed.
Is pushed down by the push rod 52 to lower it, and a long groove 66 a formed at the lower end thereof is engaged with the pin 38 a of the stopper 38. In the illustrated powder molding press, the slide block 20 and the stopper 38 are simultaneously removed from the stopper 30 and the fixing member 39.

Next, the operation of the powder molding press according to the present invention having the above configuration will be described mainly with reference to FIG. When the main shaft 1 rotates, the upper punch 9 and the pushing rod 52 operate by the action of the pressing cylinder 7 and the cam 51.

That is, the upper punch 9 reaches the top dead center 0
In the position (degree of rotation of the main shaft 1, the same applies hereinafter), the float plate 13 is at the highest position and the die plate 1
2 is on the rise. When the upper punch 9 starts descending, the die plate 12 completes ascending at a position of about 15 degrees, so that the powder W is immediately supplied and filled into the cavity as in the conventional case (see FIG. 3).

While the upper punch 9 continues to descend, the die plate 12 and the float plate 13 keep the ascending state. When the time reaches about 128 degrees, the upper punch 9 is inserted into the die 16 and the preliminary pressurization is started. At about 135 degrees in this way, the cylindrical member 62, which has been lowered together with the push rod 52 by the cam 51 shortly after 120 degrees, touches and presses the pressure receiving rod 64, so that the die 16 Lowering together with the plate 12 and the core rod 37, and at about 140 degrees the float plate 13
The (first punch 18) is lowered by the force of the upper punch 9 via the powder W. During operation without the powder W and the mold (idle operation), the pressing portion 57a of the pressing cylinder 57 presses the pressure receiving rod 19 to lower the float plate 13 together with the first punch 18. The die plate 12 and the float plate 13 descend substantially in synchronization with the upper punch 9.

At about 165 degrees, the float plate 1
3 stops the descent by bringing the slide block 20 into contact with the stopper 30, and when the slide block 20 reaches 180 degrees, the die plate 1
The stop 2 is stopped by the contact of the stopper 38 with the fixing member 39, the upper punch 9 reaches the bottom dead center, and the pressurization is completed (see FIG. 4).

The upper punch 9 starts to rise after the bottom dead center. However, since the pressing portion 57a of the pressing cylinder 57 presses the pressure receiving rod 19 and the cylindrical member 62 presses the pressure receiving rod 64, the float plate 13 The die plate 12 does not rise following the upper punch 9.

At about 195 degrees, the cam 51 lowers the push rod 52 again. At this time, the pressing cylinder 57 and the cushion cylinder 63 in which the pressing portion 57a and the cylindrical member 62 are in contact with the stop member 35 and the stopper member 65 are contracted by leaking a fluid such as oil. The rotation angle of the main shaft 1 is about 2
At 18 degrees, the lever 66 pivots the stopper 38 to disengage it from the fixing member 39, and the pushing rod 52 directly pushes the lower ram 6, so that the die plate 12 and the core rod 37 are connected to the lower ram 6. Descend together. Also 240
By the way, the slide block 20 moves the roller 29 to the wedge 2
1 is pushed sideways to release from the stopper 30 and the wedge 2
Since the first step portion 21a pushes the float plate 13, the float plate 13 also moves down. The molded product M is pushed out of the cavity by the lowering of the die plate 12 and the float plate 13 (see FIG. 5).

The above-described pushing state continues from about 260 to 290 degrees, and after about 290 degrees, the die plate 12 and the float plate 13 rise due to the action of the cylinders 8, 22 which have been forcibly compressed by their lowering. To start.
Hereinafter, the above cycle is repeated.

FIG. 8 shows only an example of the operation timing and the like of the upper punch 9, the die plate 12, the float plate 13, and the like. Needless to say, it is changed to.

The embodiment shown in the figure is a case of a high-speed press in which the forming depth is shallow and the forming speed of the press is high (for example, 40 rpm). The filling depth is deep (for example, 100 to 150 m
The present invention can be applied to a press having a low molding speed (for example, 6 to 24 rpm) or the like, but in such a case, the pressing cylinder 57, the stop member 35, and the pressure receiving rod 19 are omitted. Good. In such a case, air is supplied to the cylinder 22 via an electromagnetic valve to balance the air, thereby preventing the float plate 13 from rising.

In addition to the crank press shown in the drawing in which the ram is driven by the crank mechanism, the present invention drives the ram by the eccentric mechanism, the knuckle press that drives the ram by the toggle joint, and the ram by the cam mechanism. It can also be carried out on a cam press or the like. It is also possible to add one or more float plates provided with punches, and insert and insert the punches between the second punch 32 and the core rod 37.

[0035]

As described above, in the powder molding press according to the first aspect, the upper punch attached to the upper ram which is moved up and down by the rotation of the main shaft, and the upper punch is fitted from above to below. A die plate provided with a die and provided vertically below the upper punch; a float plate provided vertically below the die plate by inserting a first punch into the die from below and a second plate; A base plate fixedly mounted on a frame below the float plate by inserting a punch into the first punch from below and a core rod inserted into the second punch from below and a lower part of the base plate In a powder molding press having a lower ram connected to the die plate, an extruding rod that can be moved up and down in the axial direction, A press cylinder that presses the float plate downward with a press portion, and a lift plate that rotates with the main shaft, lowers the push rod, and lifts the float plate when the upper punch completes pressurization and rises. And a cam that prevents the floating plate from being lifted with a simple structure, unlike the conventional one that operates the cylinder for preventing floating with a dedicated cam. In addition, the cam and the push rod can be used for multiple purposes.

A slide block which comes into contact with the stopper to stop the float plate at the pressure completion position, and a wedge which is pushed down by the pushing rod to lower the float block from the stopper to lower the float plate. In this configuration, since the cam and the push rod are also used for releasing the stop of the float plate and subsequently pushing down the float plate, the structure is further simplified and the cost can be reduced. Further, unlike the conventional one in which the stop of the float plate is released by the extrusion screw of the die plate, there is no restriction on the descending stroke, so that an extremely thin molded product can be molded without any trouble.

When the base plate is provided with a stop member for bringing the pressing portion of the pressing cylinder into contact with the stopper almost at the same time when the slide block comes into contact with the stopper, the lowering of the float plate in the extrusion stroke affects the pressing cylinder. It can be controlled correctly without being controlled.

Further, a stopper is provided on the lower ram to stop the lower ram at the position where the pressing is completed by contacting the fixing member, and the pushing rod is provided with a releasing means for releasing the stopping member from the fixing member after the pressing is completed. With the attached structure, the cam and the push rod are also used for releasing the stop of the lower ram, so that the structure is further simplified.

When the push rod is provided with a cushion cylinder which pushes down the lower ram at the pressing portion by the downward movement of the push rod during pressurization, the cam and the push rod are also used for pushing down the die plate. So that
Further, the structure is simplified.

In the case where a stopper member is provided on the frame at approximately the same time that the stopper comes into contact with the fixing member and the pressing portion of the cushion cylinder is brought into contact with the fixing member, and the lower ram is directly lowered by the pushing rod, The lowering of the die plate in the stroke can be correctly controlled without being affected by the cushion cylinder.

Furthermore, an upper punch attached to an upper ram which is moved up and down by rotation of a main shaft, and a die into which the upper punch is inserted from above to below, and a die provided vertically below the upper punch so as to be freely movable. A plate, a first punch inserted into the die from below, a float plate provided vertically below the die plate, and a second punch inserted into the first punch from below, and A base plate fixedly provided on the frame below the float plate; and a lower ram provided below the base plate and connected to the die plate while inserting a core rod into the second punch from below. In the powder molding press, a cam that rotates together with the main shaft, and is lowered by the cam, lowers the float plate when pressurized, and If you have a structure provided with a push rod to release the fixation of the float plate and the bottom ram when pressure completes lowering the float plate and a lower ram, 1
The structure is simple and the cost is low, because it is possible to make use of different kinds of cams and push rods.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a powder molding press according to the present invention.

FIG. 2 is a side view of a main part of the powder molding press of FIG.

FIG. 3 is a cross-sectional view of a main part showing a powder filling state.

FIG. 4 is a cross-sectional view of a main part in a pressurized state.

FIG. 5 is a cross-sectional view showing a completed state of extrusion of a molded product.

FIG. 6 is a view showing a state in which a float plate is supported by a cylinder and the like.

FIG. 7 is a sectional view showing a relationship between an adjusting member, a nut member, and the like.

FIG. 8 is an operation diagram of an upper punch, a die plate, a float plate, and the like.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main shaft 2 Frame 5 Upper ram 6 Lower ram 9 Upper punch 12 Die plate 13 Float plate 14 Base plate 16 Die 18 First punch 20 Slide block 21 Wedge 30 Stopper 32 Second punch 35 Stopping member 37 Core rod 38 Stopper 39 Fixing member 51 Cam 52 Push rod 57 Pressing cylinder 57a Pressing portion 62 Cylindrical member (pressing portion) 63 Cushion cylinder 65 Stopper member 66 Lever (release means)

Claims (7)

(57) [Claims] 1. A die plate provided with an upper punch attached to an upper ram which is moved up and down by rotation of a main shaft, and a die into which the upper punch is inserted from above to below, and provided vertically below the upper punch. A float plate which is vertically inserted below the die plate by inserting a first punch into the die from above and a float plate which is inserted vertically from below into the first punch by a second punch. A base plate fixedly provided on the frame below the plate, and a lower ram provided below the base plate and connected to the die plate while inserting a core rod into the second punch from below. In a powder molding press, an extruding rod that can move up and down in the axial direction, and a pressing cylinder that presses the float plate downward with a pressing portion by descending the extruding rod. And a cam that rotates together with the main shaft, lowers the push rod, and prevents the float plate from floating with the pressing cylinder when the upper punch completes pressurization and rises. And powder molding press. 2. A float block which comes into contact with a stopper to stop the float plate at a pressurizing completion position, is pushed down by an extrusion rod, moves down, removes the slide block from the stopper, and lowers the float plate. 2. The powder molding press according to claim 1, further comprising a wedge to be formed. 3. The powder molding press according to claim 2, wherein the base plate is provided with a stop member for bringing the pressing portion of the pressing cylinder into contact almost simultaneously with the contact of the slide block with the stopper. 4. The lower ram is provided with a stopper which abuts on the fixing member to stop the lower ram at the position where the pressurization is completed. 2. The method according to claim 1, further comprising:
4. The powder molding press according to 2 or 3. 5. The push rod is provided with a cushion cylinder which pushes down a lower ram at a pressing portion by a push-down portion when the push rod is lowered when pressurized, and which is lowered. Powder molding press. 6. The frame is provided with a stopper member for bringing the pressing portion of the cushion cylinder into contact with the fixing member almost at the same time when the stopper comes into contact with the fixing member, and for directly lowering the lower ram by the pushing rod. The powder molding press according to claim 5, wherein 7. A die plate provided with an upper punch attached to an upper ram which is moved up and down by rotation of a main shaft, and a die into which the upper punch is inserted from above to below, and provided vertically below the upper punch. A float plate which is vertically inserted below the die plate by inserting a first punch into the die from above and a float plate which is inserted vertically from below into the first punch by a second punch. A base plate fixedly provided on the frame below the plate, and a lower ram provided below the base plate and connected to the die plate while inserting a core rod into the second punch from below. In a powder molding press, a cam that rotates together with the main shaft, and is lowered by the cam, lowers the float plate when pressurized, and when pressurization is completed. A powder molding press, further comprising: an extrusion rod for releasing the float plate and the lower ram by releasing the fixation of the float plate and the lower ram.