JPH05255701A - Packing device for powder molding - Google Patents

Abstract

PURPOSE:To obtain the packing device for powder molding which can easily change the number of times of the forward and backward movements of a shake cup and prevents the interference with an upper punch in spite of such change. CONSTITUTION:This packing device has a rotary encoder for detecting the position of the upper punch vertically moved by a main driving source and oscillates an oscillatably supported arm member 32 by a driving source for packing. The arm member 32 and the shake cup 20 are connected by a connecting member 44. The driving source for packing is controlled according to the detected position to move the shake cup 20 back and forth. The main driving source is stopped when the arrival of the upper punch at a top dead center is detected during the forward and backward movements.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder molding filling device for dropping powder into a die hole formed in a die during powder molding.

[0002]

2. Description of the Related Art Conventionally, at the time of powder molding, a powder molding filling device has been used in which a shake cup is reciprocally moved on a die plate to automatically drop the powder into a mold cavity. In such an apparatus, an upper punch that moves up and down compresses the powder in the mold cavity, then withdraws from the mold cavity and discharges the molded product from the mold cavity. After that, by the time the upper punch descends, the shaker cup moves back and forth on the mold cavity so that the powder can be dropped from the shaker cup into the mold cavity. Need to synchronize. Therefore, the rotation of the main shaft driven by the main drive source is converted into a reciprocating motion by a crank mechanism or a link mechanism to vertically move the upper punch, and the cam rotated by the main shaft reciprocates the shake cup. Was configured as.

[0003]

However, in such a conventional device, the operation of the shake cup is determined by the shape of the cam, and for example, the fluidity of the powder is poor,
If you want to increase the number of reciprocating movements of the shake cup,
There was a problem that the shape of the cam had to be changed, which was not easy to change. In addition, the reciprocating motion of the shake cup must be completed before the upper punch descends, and if the fluidity is poor, the shake cup speed cannot be increased. However, there is a problem that it is difficult to increase the number of reciprocating motions due to the upper punch.

SUMMARY OF THE INVENTION Therefore, the present invention has an object to solve the above-mentioned problems, and it is possible to easily change the number of reciprocating movements of a shake cup, and to prevent interference with the upper punch even if it is changed. To provide.

[0005]

In order to achieve such an object, the present invention has the following constitution as a means for solving the problem. That is, a shake cup is provided which can reciprocate on a die plate holding a die having a die hole into which an upper punch vertically moved by a main drive source enters, and the shake cup is reciprocated to move to the die hole. In a powder molding filling device for dropping powder, the position detection means for detecting the position of the upper punch and an arm member integrally attached to a drive shaft that is rockably driven by a filling drive source are provided, and the arm member is also provided. And a shake driving member, which includes a connecting member for connecting the shake cup to the reciprocating motion of the arm member by rocking the arm member, and a filling driving unit that reciprocally drives the shake cup by the filling driving source, and a position detecting unit. The filling drive source is controlled according to the detected position of the upper punch to reciprocate the shake cup, and the shake shaker is moved. And a filling control means for stopping the main drive source when it is detected that the upper punch has come to a predetermined position during the reciprocating movement of the punch. Is that.

[0006]

In the powder molding filling apparatus having the above structure, the position detecting means detects the position of the upper punch when the upper punch is moved up and down by the main drive source. Then, the filling control means controls the filling drive source in accordance with the position of the upper punch detected by the position detection means, and the filling drive means,
The arm member is rocked together with the drive shaft by driving the filling drive source. The swing of the arm member causes the connecting member to reciprocate the shake cup. When it is detected that the upper punch has reached a predetermined position during the reciprocating movement of the shake cup, the main drive source is stopped to stop the vertical movement of the upper ram.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a side view of a powder molding filling apparatus according to an embodiment of the present invention. Reference numeral 1 denotes a frame of a powder molding apparatus, and a crankshaft 2 is rotatably supported on the frame 1 as shown in FIG. 4, and the crankshaft 2 has a main drive source such as a servomotor. 4 are connected. Moreover, the rotary shaft of the rotary encoder 5 is connected to the crankshaft 2 as position detecting means for outputting a pulse signal in response to the rotation of the crankshaft 2.

Further, one end of a link member 6 is rotatably inserted in the crankshaft 2, and the other end of the link member 6 is attached to an upper ram 8 supported by the frame 1 so as to be vertically movable. It is rotatably supported. An upper punch 10 is attached to the upper ram 8.

A lower punch 12 is fixed to the frame body 1 below the upper punch 10 so as to face the upper punch 10.
A die 16 having a die hole 14 into which 0 and the lower punch 12 can be inserted is held by a die plate 18. In this embodiment, the die plate 18 is supported on the frame 1 so as to be slidable in the vertical direction, and is configured to be moved up and down by a drive mechanism (not shown).

A shake cup 20 is arranged on the die plate 18 so as to slide and reciprocate.
A funnel 22 is attached to the shake cup 20, and the funnel 22 receives the powder received by the shake cup 2.
It is arranged so that it can be discharged onto the die plate 18 which is in contact with 0.

A hose 26 connected to a tank 24 fixed above the frame 1 is inserted into the funnel 22 so that the powder in the tank 24 is supplied. On the other hand, a drive shaft 28 is rotatably supported on the frame body 1, and a charging drive source 30 such as a servomotor is connected to the drive shaft 28 as shown in FIG. An arm member 32 extending in the axial direction is fitted on the drive shaft 28, and the lock member 33 causes the drive shaft 28 and the arm member 32 to rotate integrally.

A parallel link member 36 is rotatably attached to a fixed shaft 34 fixed to the frame 1 in parallel with the drive shaft 28, and both ends of the arm member 32 and the parallel link member 36 are attached. A lever member 42 is rotatably attached to each of the fulcrum pins 38 and 40 to form a so-called parallel link.

A connecting member 44 is rotatably supported by a fulcrum pin 46 on the lever member 42, and an inverted U-shaped groove 48 is formed at the tip of the connecting member 44. Into the groove 48, a horizontal support shaft 50 provided integrally with the shake cup 20 is inserted.

Further, a pneumatic cylinder 52 is connected to the lever member 42 and the connecting member 44 so that both ends thereof are rotatably supported, and compressed air supplied to the pneumatic cylinder 52 is used. The shake cup 20 is configured to be pressed and urged against the die plate 18 via the connecting member 44.

Further, the dock member 5 is attached to the drive shaft 28.
4 is integrally mounted, and a bolt 56 is screwed to the tip of the dock member 54. Then, corresponding to the bolt 56, a forward end limit switch 58 and a backward end limit switch 60, which are two proximity switches.
And are provided.

In the forward end limit switch 58, the arm member 32 is swung so that the shake cup 20 is moved to the mold hole 14.
When it is in the position shown by the solid line in FIG.
It is provided at a position where the bolt 56 is detected. Further, in the backward end limit switch 60, the arm member 32 swings, the shake cup 20 returns to the rear, and the descending upper punch 10 does not interfere with the shake cup 20 and the like.
It is provided at a position for detecting the bolt 56 when it is at the position indicated by the alternate long and two short dashes line.

In this embodiment, the drive shaft 28, the filling drive source 30, the arm member 32, the lock member 33, and the fixed shaft 3 are used.
4, the parallel link member 36, the fulcrum pins 38, 40, the lever member 42, the connecting member 44, the fulcrum pin 46, the pneumatic cylinder 52, the dock member 54, the forward end and backward end limit switches 58, 60, the filling drive source means. I am configuring.

The main drive source 4, the rotary encoder 5, the filling drive source 30, the forward end limit switch 58, and the backward end limit switch 60 described above are connected to a controller 70. The control device 70 is configured as a logical operation circuit centering on a well-known CPU 72, a ROM 74 that stores a control program and data in advance, and a readable / writable RAM 76, and input / output circuits 78 are connected to each other via a common bus 80. , Is configured to perform input / output with the outside.

The CPU 72 then outputs a pulse signal from the rotary encoder 5, forward end limit switch 58, and backward end limit switch 60 via the input / output circuit 78.
Input signals from, and these signals, ROM7
4. C based on the programs and data in RAM76
The PU 72 is configured to output a control signal to the main drive source 4 and the filling drive source 30 via the input / output circuit 78.

Next, the operation of the powder molding filling device of this embodiment described above will be described with reference to the flow chart shown in FIG. First, the main drive source 4 is driven to rotate, and the crankshaft 2
Is rotated. As a result, the upper ram 8 is moved up and down via the link member 6, and together with the upper ram 8, the upper punch 1
0 also moves up and down. Then, the upper punch 10 has a die hole 14
The powder in the mold cavity 14 is compressed and molded. In this embodiment, at this time, the die plate 18 is lowered in accordance with the amount of movement of the upper ram 8 so that pressure is relatively applied from both upper and lower sides.

When the upper ram 8 passes through the bottom dead center and rises, the die plate 18 is further lowered and the lower punch 1
2, the molded product is discharged from the mold cavity 14. Then, the die plate 18 is raised according to the filling amount of the powder.
On the other hand, the rotation angle of the crankshaft 2 is detected by the rotary encoder 5, and when this rotation angle reaches a predetermined angle, in the present embodiment, as shown in FIG. 6, the rotation after the upper ram 8 starts rising. Whether or not to move forward is determined depending on whether or not the angle has reached approximately 260 degrees (step 10).
0).

When it is determined that the predetermined angle has been reached, the filling drive source 30 is driven to drive the arm member 32 via the drive shaft 28.
Rock. Then, the shake cup 20 is slid on the die plate 18 via the connecting member 44, and the mold hole 1
It advances toward 4 (step 110).

Then, the dock member 54 also swings via the drive shaft 28, and the forward end limit switch 58 moves the bolt 5
It is determined whether 6 is detected (step 120). When it is not detected, the forward movement is continued, and when it is detected, the shake is started (step 130). Shaking is performed at a preset speed, a set number of round trips, and a shake cup 20.
The filling drive source 30 is rotationally driven in the forward and reverse directions so that the reciprocating motion of the mold is performed within a predetermined range on the mold cavity 14.

As the shake cup 20 is shaken on the mold cavity 14, the powder supplied from the tank 24 to the funnel 22 through the hose 26 is transferred from the funnel 22 to the mold cavity 1.
4 is filled. The speed of this shake and the number of round trips are
It may be set appropriately according to the fluidity of the powder.

When the shake is started, next, it is determined whether or not the upper punch 10 has reached a predetermined position, in the present embodiment, the top dead center, and the rotation angle of the crankshaft 2 is
It is judged whether or not it is 0 degree (step 140). If the rotation angle of the crankshaft 2 is 0 degree, the upper ram 8 is in a position to start descending due to the rotation of the crankshaft 2,
At that time, the shake cup 20 reciprocates on the mold cavity 14. Therefore, when the upper punch 10 descends, it interferes with the shake cup 20 and the funnel 22 and is damaged.

While the shake is being executed, when the rotation angle of the crankshaft 2 becomes 0 degree, the drive of the main drive source 4 is stopped and the lowering of the upper ram 8 is stopped (step 1).
50). When the rotation angle is not 0 degree, the drive of the main drive source 4 is continued. Next, the shake cup 20 is reciprocated by the set number of times of reciprocation, and it is determined whether or not the shake is completed (step 160). ..

On the other hand, when the shake is finished, the main drive source 4
It is judged whether or not the driving of the
0), when it is stopped, the main drive source 4 is driven again (step 180). After that, or when not stopped, the filling drive source 30 is driven as it is,
The shake cup 20 is slid on the die plate 18 so as to be retracted from the die hole 14 until the backward end limit switch 60 detects the bolt 56. (Step 190). After moving backward, this control process is once terminated.
The execution of this filling control process works as a filling control means.

As described above, since the powder molding filling device of this embodiment is provided with the filling driving source 30 separately from the main driving source 4, the conditions preset in the control device 70 are set to the powder filling condition. By changing the shake according to the fluidity and the like, the shake conditions such as the number of reciprocations of the shake cup 20 can be easily changed. Further, due to this change, the shake time becomes long, and the drive of the main drive source 4 is stopped unless the reciprocating motion of the shake is completed before the upper punch 10 starts descending. Therefore, the upper punch 10 descends during the reciprocating motion of the shake cup 20, and the shake cup 20 and the funnel 22 are
It can prevent damage without interfering with etc.

Next, a second embodiment different from the above-mentioned embodiment will be described with reference to FIG. The same members as those in the above-described embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In the second embodiment, the fulcrum pins 3 are respectively provided at both ends of the arm member 32 and the parallel link member 36.
A lever member 90 is rotatably attached by 8, 40. A support member 92 is attached to the lever member 90, and a U-shaped groove 9 is provided at the tip of the support member 92.
4 are formed. A pin 97 fixed to the connecting member 96 is hooked on the groove 94, and the connecting member 9
The other end of 6 is rotatably engaged with the shake cup 20.

Both ends of the frame 1 and the connecting member 96 are rotatably rotatably supported, and pneumatic cylinders 98 are connected to each other, and compressed air supplied to the pneumatic cylinders 98 is used. The shake cup 20 is configured to be pressed and urged against the die plate 18 via the connecting member 96.

Even in this case, as in the above-described embodiment,
The shake cup 20 can be reciprocated along the die plate 18. The present invention is not limited to the embodiments as described above, and can be implemented in various modes without departing from the gist of the present invention.

[0032]

As described in detail above, the filling apparatus for powder molding according to the present invention is provided with the filling drive source separately from the main drive source. Therefore, the filling drive source can be adjusted according to the fluidity of the powder. The shake condition can be easily changed by changing the control condition of. Also, due to this change, even if the shake time becomes long, if the reciprocating motion of the shake is not completed by the time the upper punch starts descending, the drive of the main drive source will be stopped and interference with the upper punch will occur. This has the effect of preventing damage and preventing damage.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a powder molding filling device according to an embodiment of the present invention.

FIG. 2 is a partially cutaway rear view of the powder molding filling device according to the present embodiment.

3 is a cross-sectional view taken along the line AA in FIG.

FIG. 4 is a block diagram showing a configuration of an electric system of this embodiment.

FIG. 5 is a flowchart showing an example of a filling control process performed in the control device of the present embodiment.

FIG. 6 is a timing chart showing the relationship between the movement amount of the upper ram and the shake cup and the rotation angle of the crankshaft in the present embodiment.

FIG. 7 is a partially cutaway side view of a powder molding filling device as a second embodiment.

[Explanation of Codes] 1 ... Frame 2 ... Crankshaft
4 ... Main drive source 5 ... Rotary encoder 10 ... Upper punch
12 ... Lower punch 16 ... Die 18 ... Die plate
20 ... Shake cup 30 ... Filling drive source 32 ... Arm member
44 ... Connecting member 70 ... Control device

Claims (1)

[Claims] 1. A shake cup that can reciprocate on a die plate holding a die having a die hole into which an upper punch vertically moved by a main drive source enters is provided, and the shake cup reciprocates to move the shake cup. In a powder molding filling device for dropping powder into a mold cavity, the device has position detection means for detecting the position of the upper punch, and an arm member integrally attached to a drive shaft which is rockably driven by a filling drive source, Filling drive means for connecting the arm member and the shake cup so as to reciprocate the shake cup by swinging the arm member, and filling drive means for reciprocating the shake cup by the filling drive source; The filling drive source is controlled in accordance with the position of the upper punch detected by the detecting means to reciprocate the shake cup, A filling device for powder molding, comprising: a filling control unit that stops the main drive source when it is detected that the upper punch has reached a predetermined position during reciprocating movement of the wake cup.