JPH0320319B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a with-lower type powder forming press.

Generally, in this type of powder molding press,
When the shape of the workpiece changes, there are four adjustments to be made to the press machine: (a) upper ram adjustment (b) die push-down position adjustment (c) stopper position adjustment (d) filling adjustment. The details of each adjustment work are as follows: (a) Upper ram adjustment means changing the thrust amount of the upper punch.

(b) Adjusting the die push-down position is to change the push-down amount of the die in the pressurizing process.

(c) Stopper position adjustment means changing the stop position of the die at the end of pressurization.

(d) Filling adjustment means changing the amount of material powder filled into the die.

During the above adjustment (d), the filling adjustment is extremely easy as it only requires a spiral operation of the nut on the lower ram. Furthermore, (a) upper ram adjustment also allows the amount of thrust of the upper punch to be easily changed by screwing the upper ram onto the vertical axis. However, (b) adjustment of the die push-down position and (c) adjustment of the stop position are key points for obtaining an optimal and uniform density when changing the shape of the workpiece or the raw material powder, and are extremely important operations. Therefore, in the molding process using the non-simultaneous three-stage pressurization method, we will explain both adjustment operations.
After powder filling, when the upper punch curve intersects with the top surface position of the die and the upper punch starts pressing, the upper punch plunges into the stopped die, so a downward pressing force R acts on the upper layer of the powder, and the first Stage compression is performed. From this point on, the die descends together with the upper punch, but until just before the end of the pressurization, the lower punch applies an upward pressing force S to the powder, and second-stage compression is performed. Even after the die eventually stops descending, the upper punch further descends and applies a downward pressing force T to the powder, thereby performing the third stage of compression. In this way, according to the non-simultaneous three-stage pressing method, as shown in Figure 5, powder compaction is performed while maintaining the density balance between the top and bottom of the product through the three-stage compression operation from the first stage to the third stage. be exposed.

Next, in the non-simultaneous three-stage compression described above, if you want to relatively increase the density at the bottom of the product, as shown in Figure 6, while the die stopper position is fixed, the die push-down position is adjusted by a certain amount α. The second stage pressurization amount S' is adjusted by adjusting the amount S'. On the other hand, if you want to further increase the density at the top and bottom of the product, as shown in Figure 7, you can adjust the die push-down position by a certain amount α, and at the same time adjust the stopper position by the same amount β. Then,
Adjust the pressurization amounts S″ and T″ of the second and third stages.

In this way, adjusting the die push-down position and stopper position are important operations in powder molding, but in conventional with-lower type powder molding presses, the die push-down position adjustment is installed on the base plate of the press machine. The device and the stopper position adjustment device installed on the same base were individually adjusted manually. However, it is not only extremely difficult to achieve this accuracy through individual manual adjustment operations, but also in the unlikely event that the adjustment accuracy is not achieved or if the adjustment is made incorrectly, the density of the workpiece may become abnormal in some parts. There was a problem that this caused the mold to become damaged.

This invention was made to solve the above-mentioned problems, and its purpose is to enable the die push-down position adjustment device and the stopper position adjustment device to perform position adjustment operations in synchronization. At the same time as the connection, the die push-down position adjustment device can be operated independently, making it easy and reliable to achieve accuracy, preventing adjustment mistakes and eliminating mold damage, and ensuring constant optimization and uniformity. An object of the present invention is to provide a hydroal type powder molding press capable of smoothly and easily molding dense workpieces.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, to explain the configuration, as shown in Figure 1,
On the bed 1a of the press machine 1, a die set 3 shown below is replaceably mounted. The die set 3 is placed on the bed 1a of the press machine 1 by means of a fixed plate 36 having a lower punch 35 erected in the center of its surface. A die plate 33 with a die 34 housed in the center of the surface is arranged above the fixed plate 36, and a pull-down plate 38 with a core rod 37 erected at the center of the surface is arranged below the fixed plate 36. are arranged, and the die plate 33 and the pull-down plate 38
are connected to each other by rods 39 loosely inserted into the four corners of the fixed plate 36, so that they can move up and down as a unit. In this case, core rod 37 is
It penetrates through the fixed plate 36 and the lower punch 35 and is housed in the center of the interior of the die 34 so as to be vertically movable. Moreover, in the upper part of the die plate 33,
An upper punch holder 31 having an upper punch 32 vertically disposed at the center of its surface is arranged so as to be movable up and down by loosely inserting rods 31a into the left and right holes of the die plate 33.

The upper punch holder 31 of the die set 3 according to the above-mentioned embodiment is attached to the upper ram 2 which is in charge of lower pressure operation at the upper part of the press machine 1 so as to be able to move up and down integrally via the vertical shaft 2a. Further, a lower ram 4 is attached to the lowering plate 38 of the die set 3 at the lower part of the press machine 1 for performing the above-described lowering operation of the die plate 33. A threaded portion 4a is provided on the outer circumferential surface of the lower ram 4, and a filling adjustment nut 6 is screwed into the threaded portion 4a so as to be freely spiral. Furthermore, at the lower end of the lower ram 4,
Rods 5a of pneumatic cylinders 5, which are arranged on the base 1b of the press machine 1 so as to be able to be moved up and down, are concentrically connected.

A base plate 7 having a U-shape as a whole is attached to the lower body portion of the lower ram 4 so as to be movable up and down integrally with the base plate 7 inserted through the intermediate portion. On the left and right upper surfaces of the base plate 7, the following die push-down position adjusting devices B are arranged symmetrically. To explain the above-mentioned die push-down position adjusting device B from one side of the base plate 7, on the inside position of the vertical surface of the base plate 7, there is a
A horizontal support shaft 9 is provided protrudingly. A swinging lever 8 having a downwardly protruding protrusion 8a hanging from the lower portion thereof is disposed on the support shaft 9 so as to be freely swingable by fitting into the support shaft hole. Note that a vertical through hole 8b is provided at a midway position of the arm portion on one end side of the swing lever 8. The above swing lever 8
A vertical hole is provided in the horizontal surface of the base plate 7 on one end side, and a stepped release pin 10 is fitted in this position so as to be movable up and down with the upper end protruding due to bearing support. . The lower end of the release pin 10 is mounted on the tip of the arm on one end side of the swing lever 8 so as to be able to move up and down integrally.
In addition, a vertical hole with a somewhat larger diameter is provided in the horizontal surface of the base plate 7 on the other end side of the swing lever 8.
At this position, a press pin 11 whose lower end portion is formed with a large diameter is loosely inserted so as to be movable up and down. The lower end of this pressing pin 11 is placed on the arm on the other end side of the swing lever 8. A pressing spring 12 is inserted between the upper end of the large diameter hole at this position and the lower end of the pressing pin 11 so as to support the pin 11 downward. As a result, the swinging lever 8 continues to maintain a posture in which both arms are in a substantially horizontal state due to the downward pressure of the release pin 10, and the push-down protrusion 8a is in a substantially vertical state, as shown in FIG. It becomes possible to maintain the Furthermore, a case 1 is provided on the upper surface of the base plate 7, which is approximately midway between the release pin 10 and the pressing pin 11.
9 is placed. Inside one side of the case 19, a worm 21 fitted onto a horizontal shaft 20 is rotatably housed, similar to the worm 15 of a stopper position adjustment device A to be described later. A worm wheel 22 having a screw hole 22a in its core is housed adjacent to the worm 21 so as to be able to rotate in conjunction with the worm 21 while meshing with the worm 21. Concentric with the screw hole 22a of the worm wheel 22, a vertical hole is also provided in the surface of the base plate 7 directly below the screw hole 22a. At this position, the braking member 23, which has a threaded portion 23a on the outer circumferential surface other than the upper end, is attached to the threaded hole 22 of the braking member 23.
It is arranged to be rotatable by screwing into 2a. In this case, the upper end portion of the braking member 23 projects upwardly and externally from the case 19. The lower end side is loosely inserted into the through hole 8b of the swing lever 8. A hole is provided in the center of the braking member 23 from the lower end to a mid-height position, and a spline shaft hole 23b is provided at the lower end of this hole.

Die push-down position adjusting device B according to this aspect
Similar to the stopper position adjusting device A, which will be described later and is shown with a plane part in FIG.
A fixed-side motor is directly connected to the 0 via a gear, and by driving the motor, the left and right parts can perform similar operations at the same time.

On the base plate 1b of the press machine 1, located directly below the die push-down position adjusting device B, the following stopper position adjusting device A is arranged symmetrically. To explain the above stopper position adjustment device A from one side of the base plate 1b, a vertical hole is provided through the surface portion of the base plate 1b that is on the same perpendicular line as the above-mentioned support shaft 9. The case 19 of the die push-down position adjusting device B is placed on the surface above this vertical hole.
A case 13, which is substantially the same as the case 13 in a larger size, is more fixedly arranged in the same direction. This case 13
A worm 15 fitted onto the horizontal shaft 14 is housed inside one side of the worm 15 so as to be rotatable therein. At a position adjacent to this worm 15, there is a screw hole 1 in the center.
6a, and a gear 16b is provided in the lower half of the outer peripheral surface.
The worm wheel 16 provided with the worm 15
The worm wheel is interlocked with the worm wheel so that it can rotate in conjunction with the worm wheel. A key 13a is provided to protrude in the radial direction from one end of the inner diameter surface of the upper hole of the case 13, which is concentric with the worm wheel 16. Screw hole 16 of the worm wheel 16
A is provided with a threaded portion 17a on the outer circumferential surface other than the upper end portion, and a stopper 17 provided with a vertical keyway 17b is inserted into one end of the threaded portion 17a so as to be movable up and down. In this case, the upper end of the stopper 17 is projected to the outside of the case 13.
The outer peripheral threaded portion 17a is connected to the worm wheel 16.
is screwed into the screw hole 16a of the case 13, and in this state the key groove 17b of the stopper 17 is inserted into the key 13a of the case 13.
is mated to. Further, inside the case 13 on the opposite side of the worm 15, a vertical shaft 18 is provided with a gear 18a at its lower end and a spline shaft portion 18b at its upper outer peripheral surface. They are arranged so that they can rotate in conjunction with each other. Note that the vertical shaft 18 except for the lower part thereof projects vertically to the upper exterior of the case 13. Spline shaft portion 18 of this vertical shaft 18
b is inserted into the spline shaft hole 23b of the above-mentioned braking member 23, which is disposed directly above it, so that transmission of integral rotation is possible.

The stopper position adjustment device A according to this aspect is
As shown in FIG. 4, sprockets 40 of the same shape are fitted on the left and right horizontal shafts 14, respectively, and a series of chains 41 are hung between the sprockets 40. A motor 42 is directly connected to one of the horizontal shafts 14, and by driving the motor 42, the left and right parts of the stopper position adjustment device A can be operated in the same manner at the same time.

Note that the vertical shaft 2a of the upper ram 2 mentioned above is provided with a threaded portion 2b on its outer peripheral surface. A worm wheel 30 having a screw hole 30a provided on the inner diameter surface is screwed into the threaded portion 2b. This worm wheel 30 meshes with a worm 29 fitted onto the horizontal shaft 28 adjacent to it. In this case, the horizontal shaft 28 is directly connected to a motor (not shown), and the upper ram can be adjusted by driving the motor.

Also, there are brackets 2 on both sides of the body of the upper ram 2.
4 are provided protrudingly, and a hydraulic cylinder 25 is provided downward at each end of the press machine 1.
It is designed to output a larger output than the pneumatic cylinder 5 disposed on the base plate 1b.
A push-down pin 26 is vertically attached to each rod 25a of the hydraulic cylinder 25. The distance between the push-down pin 26 and the braking member 23 disposed on the same perpendicular line directly below the push-down pin 26 is set to be somewhat longer than the distance between the upper punch 32 and the die 34.

Furthermore, at each side external position of the push-down pin 26, there is a knock pin 27 at its lower end that moves up and down in synchronization with the upper ram 2 by a cam (not shown) fitted to the main shaft of the press machine. The release pins 10 are arranged in parallel so that the release pins 10 can be pressed. Note that 1c is an upper ram support portion provided inside the upper part of the press machine 1.

With the above-mentioned configuration, when the raw material powder is supplied into the die 34 of the die plate 33 via the feeder and the upper ram 2 is operated under pressure by operating the press machine 1, the upper punch 32 is moved to the upper part of the die 34 in the stopped state. rush inside. At this point, as shown in FIG. 5, an initial pressing force R is applied to the upper powder in the die 34, and the first stage compression is performed. Immediately after this, the lower end portion of the push-down pin 26 that has descended integrally with the upper ram 2 comes into contact with the braking member 23 of the die push-down position adjustment device B. Therefore, from this point on, via the base plate 7 provided with the braking member 23,
Lower ram 4, pull-down plate 38, die plate 3
3 are lowered integrally against the air pressure of the pneumatic cylinder 5 by continuously lowering the pressure of the upper ram 2. During this integral descent, an upward pressing force S is applied to the powder in the die 34 by the lower punch 37 which is in a fixed state, and the powder is compressed in two stages. This relatively increases the density in the lower part of the powder.

When the upper ram 2 is lowered, the swing lever 8 is also lowered together with the base plate 7, so the lower end of the push-down protrusion 8a will soon come into contact with the stopper 17 of the stopper position adjustment device A, and the lower ram 4 will be lowered. The lowering of plate 38 and die plate 33 is stopped. Therefore, at this point, the powder in the die 34 is subjected to a downward pressing force T by the upper punch 32 integrated with the upper ram 2, which continues to descend, and is compressed in three stages. As a result, the powder in the die 34 can have an overall uniform density while balancing the density in the upper and lower parts. At this time, the lower end of the push-down pin 26, which is integral with the hydraulic cylinder 25, comes into contact with the upper end of the brake member 23, as shown in FIG.
3 and the base plate 7 are not subjected to a pressing force exceeding a specified value.

When the knock pin 27 descends after the above-mentioned pressurization is completed, the lower end of the knock pin 27 touches the release pin 10.
Press. For this reason, the release pin 10 descends and one arm side of the swing lever 8 is pushed, so that the swing lever 8 is moved in the direction in which the other arm side is raised with the support shaft 9 as a fulcrum. oscillate. Therefore, the push-down protrusion 8a of the swing lever 8 comes off the upper end of the stopper 17, and the subsequent downward movement of the knock pin 27 pushes the die plate 33.
is further lowered one step to the position shown in FIG. 3 as the base plate 7, lower ram 4, and pull-down plate 38 descend. As a result, the upper surface of the lower punch 35 is aligned with the upper surface of the die 34, and the molded workpiece W is extruded onto the die plate 33.

Note that after the workpiece W is moved to a predetermined position from above the die plate 33 by other means, the base plate 7,
The lower ram 4, pull-down plate 38 and die plate 33 are pushed up to their original positions shown in FIG. Of course, immediately before that, the upper ram 2 has been pulled up to its original position shown in FIG. 1 by the crank of the main shaft of the press machine, so the upper punch 32 is also
It can be returned to its original position as shown in the figure. This completes the powder molding process, and by repeating this process, the workpieces W can be molded one after another.

Next, when the shape of the workpiece changes and you want to increase the density of the top and bottom of the product, you can rotate the horizontal shaft 14 in a predetermined direction by driving the motor 42 of the stopper position adjustment device A shown in FIG. The integrated worm 15 rotates in the same direction. Therefore, since the worm wheel 16 meshing with the worm 15 rotates in a predetermined direction, the screw hole 1 in the inner diameter portion
The stopper 17 screwed into the stopper 6a is moved upward by the spiral operation of its outer periphery. At this time, since the keyway 17b is fitted into the key 13a of the case 13, the stopper 17 can be raised without rotating.

When the worm wheel 16 rotates, the vertical shaft 18 also rotates in a predetermined direction due to the rotation of the gear 18a of the vertical shaft 18 that meshes with the gear 16b of the worm wheel 16.
The braking member 23 of the die push-down position adjusting device B, which is fitted into the upper spline shaft portion 18b through the spline shaft hole 23b, also rotates in the same direction. In this case, the braking member 23 is attached to the screw hole 22 of the worm wheel 22 in this position.
Since the worm wheel 22 is screwed into the hole 22a and is in a fixed state at this time, it will descend along the screw hole 22a in the inner diameter portion. Therefore, when the stopper 17 is raised, the brake member 23 can also be lowered by the same amount at the same time. As a result, as shown in Fig. 7, the pressurization amounts S'' and T'' of the second and third stages can be simultaneously adjusted by fixed amounts α and β, and the density of the upper and lower parts of the product can be adjusted while maintaining the density balance. can be increased.

On the other hand, if you want to relatively increase the density of the lower part of the product, drive the motor of the die push-down position adjustment device B to rotate the horizontal shaft 20 in a predetermined direction, and the worm 21 integrated with this can be rotated in the same direction. rotate in the direction. Therefore, the worm wheel 22 engaged with the worm 21 rotates in a predetermined direction, and the braking member 23 screwed into the screw hole 22a on the inner diameter portion moves downward by the spiral operation of its outer periphery. . At this time, the spline shaft hole 23
b is the stopper position adjustment device A in the stopped state.
The braking member 2
3 can descend while maintaining a constant posture. As a result, as shown in Fig. 6, it is possible to lower the downward position of the die while fixing the stopper position of the die at a fixed position, and the pressurization amount S' of the second stage can be increased by a fixed amount α. It can be adjusted and the density at the bottom of the product can be relatively increased.

As explained above, the present invention is configured such that the die push-down position adjustment device and the stopper position adjustment device are connected so that the position adjustment operation is performed in synchronization,
In addition, by configuring only the die push-down position adjustment device described above to be able to operate independently, when changing the compaction density due to changes in the shape of the workpiece or material powder, the die push-down position provided on the base plate of the press machine can be adjusted. The braking member of the adjustment device and the stopper of the stopper position adjustment device disposed on the same base plate can be adjusted to the same amount at the same time by operating the motor on the base plate side. Since the position of the braking member of the die push-down position adjustment device can be adjusted independently by operating the Mold breakage accidents can be eliminated. Furthermore, by making the above adjustments, it is possible to always smoothly and easily mold a workpiece with an optimal and uniform density, thereby enhancing the functionality of the with-low-al type powder molding press and making a significant contribution to the technological improvement of this type of industry.

[Brief explanation of the drawing]

FIG. 1 is a partially longitudinal front view showing the structure of the main parts of the with-roar type powder compacting press according to the present invention and the filling state of raw material powder, and FIG. 2 is a partially vertical front view showing the state of completion of compression in the same powder compacting press. , FIG. 3 is a partially longitudinal front view showing the end of workpiece extrusion in the same press, FIG. 4 is a partially sectional plan view showing the stopper position adjusting device in the powder forming press of the present invention, and FIG. 5 is a non-simultaneous A graph showing the stroke line of the upper punch and die and the pressure applied to the filling powder when forming a workpiece using the three-stage pressure method. Figure 6 shows the same matter when forming a workpiece when the die push-down position is individually adjusted. The graph shown in FIG. 7 is a graph showing the same matter when molding a workpiece in which the die push-down position and the stopper position are adjusted in conjunction with each other. Explanation of symbols: 1...Press machine, 1a...Bed, 1b...Base, 1c...Upper ram support part, 2...
...Upper ram, 2a, 18...Vertical axis, 2b, 4a, 1
7a, 23a...Threaded part, 3...Die set, 4
... Lower ram, 5 ... Pneumatic cylinder, 6 ... Filling adjustment nut, 7 ... Base plate, 8 ... Swing lever, 8a ... Push-down convex, 8b ... Through hole, 9 ... Support shaft, 10... Release pin, 11... Press pin, 12... Spring, 13, 19... Case, 13a... Key, 14, 20, 28... Horizontal shaft, 15, 21, 29... Worm, 16, 2
2, 30... Worm wheel, 16a, 22
a, 30a...screw hole, 16b, 18a...gear, 17...stopper, 17b...keyway, 1
8b... Spline shaft portion, 23... Braking member, 2
3b...Spline shaft hole, 24...Bracket,
25... Hydraulic cylinder, 26... Push-down pin, 27... Knock pin, 31... Upper punch holder, 31a, 39... Rod, 32... Upper punch, 33... Die plate, 34... Die, 35
...Lower punch, 36...Fixing plate, 37...
Core rod, 38... Pulling plate, 40...
Sprocket, 41...Chain, 42...Motor, A...Stopper position adjustment device, B...Die push-down position adjustment device, R, R', R''...1st stage pressing force, S, S', S″……Second stage pressurizing force, T, T′,
T″...Third stage pressurizing force, α...Adjusted amount of second stage compression, β...Adjusted amount of third stage compression, W...Work.

Claims (1)

[Scope of Claims] 1. A with-roar type powder molding press in which the extrusion position of a molded product is constant, a worm that is rotated by a drive source, and a worm that is engaged with the worm and rotates according to the movement of the worm. a stopper position adjustment device having a movable worm wheel; and a stopper that is screwed into a screw hole drilled through the top and bottom of the worm wheel and moves up and down as the worm wheel rotates; A gear that is engaged with the gear portion of the worm wheel to rotate in a direction opposite to the rotation direction of the worm wheel; and a spline shaft whose lower end is integrally connected to the gear and whose upper end has a spline shape. The spline shaft is inserted into the vertical hole provided in the base plate, and the upper end surface is below the push-down pin attached to the upper ram. A die pusher comprising: a braking member that determines the push-down position of the die by coming into contact with an end face; and a worm wheel of a die push-down position adjusting device into which a threaded portion provided on the outer peripheral surface of the braking member is screwed. A with-lower type powder molding press characterized by being equipped with a lowering position adjustment device. 2. In a with-roar powder molding press in which the extrusion position of the molded product is constant, a worm is rotated by a drive source, and a worm wheel is engaged with the worm and rotates according to the movement of the worm. A stopper position adjustment device is provided, the stopper position adjusting device having a stopper that is screwed into a screw hole drilled through the top and bottom of the worm wheel and moves up and down as the worm wheel rotates; A gear that rotates in a direction opposite to the rotational direction of the worm wheel when engaged with the worm wheel, and a vertical shaft having a spline shaft portion whose lower end portion is integrally connected to the gear and whose upper end portion has a spline shape. , It has a spline hole into which the spline shaft part fits vertically, and is inserted into a vertical hole provided in the base plate, and the upper end surface abuts the lower end surface of the push-down pin attached to the upper ram. A braking member that determines the push-down position of the die; a worm wheel of a die push-down position adjusting device to which a threaded portion provided on the outer peripheral surface of the brake member is screwed; and a worm wheel that is engaged with the worm wheel to push down the die. A with-lower type powder molding press characterized by comprising a die push-down position adjustment device having a worm that transmits the rotation of a motor of the position adjustment device.