JPS5811320B2 - Funmatsu Seikei Sochi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a powder molding apparatus, and more particularly to a powder molding apparatus comprising a die member having a cavity for accommodating powder to be molded, and upper and lower punch members fitted into the die member.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a powder compacting apparatus having an adjustment mechanism for adjusting the timing of movement of a die member axially sliding relative to a punch member as desired.

According to the present invention, powder molding includes a frame having a support portion that holds a lower punch in an immovable position, and a lower ram member that is slidably attached to the frame and that raises and lowers a die member that fits into the lower punch. The apparatus includes a support block in which the frame includes a support block defining a lower limit of the lower ram member on the inner side of the lower end, and the lower ram member is rotatably attached to the frame adjacent to a drive shaft of the forming apparatus and has one arm. A bell crank 37 is engaged with a cam member on the drive shaft, and the bell crank 37 is rotatably attached to the frame, one arm is locked to the lower end of the lower ram member, and the other arm is connected to the bell crank 37 through the cylinder unit 41. - The cylinder unit 41 includes a drive mechanism consisting of a bell crank 32 connected to an arm opposite to the one arm of the crank 37, and the cylinder unit 41 has an end on the piston side and an end on the cylinder side, respectively. The cylinder unit 41 is connected to the bell crank 37 and the bell crank 32, and the cylinder unit 41 is provided at the end adjacent to the bell crank 32. A powder compacting device is obtained, which is connected to the other arm of the bell crank 32 via a telescopic adjustment link 44a.

Now, an embodiment of the powder compacting apparatus of the present invention will be described below with reference to the accompanying drawings.

Referring to FIGS. 1 and 2, there is shown a frame 1 having a shoulder portion 5 approximately in the center of its height for fixing a lower punch member 6, upper and lower ram members 2 and Powder compacting apparatus 10 of the present invention comprising 4.
It is shown.

3 indicates a cavity that accommodates a die set (not shown) in which a die member 7 and upper and lower punch members 8 and 6, which will be described below, are attached.

Figures 3a, 3b, 3c, 3d and 3e show how the die member 7 and the upper and lower punch members 8 and 6 of the powder compacting apparatus 10 of the present invention operate, and Figure 3a shows the operation of the die member 7 and the upper and lower punch members 8 and 6. The die member 7 has its lower end fitted into the lower punch member 6 and contains the powder 9 therein, and the upper punch member 8 is in an inoperative position separated from the upper surface of the die member 7 by a predetermined distance. show.

FIG. 3b shows the first stage powder compaction process, in which the die member 7 is still not moving relative to the lower punch member 6, and the upper punch member 8 has its lower end slightly inserted into the die member 7. .

FIG. 3c shows the second stage process in which the die member 7 and the upper punch member 8 simultaneously move downward relative to the lower punch member 6 to compress the powder 9.

FIG. 3d shows the third step in which the die member 7 is stopped at a predetermined position and the upper punch member 8 is pushed further into the die member 7.

FIG. 3e shows the fourth stage process in which the upper punch member 8 is raised and the die member 7 is lowered to a position where its upper surface coincides with the upper surface of the lower punch member 6 to expose and remove the product W.

Returning to FIGS. 1 and 2, the upper ram member 4 has its lower end connected to the upper punch member 8, and slides up and down along the guide 11.

A drive shaft 12 is rotatably attached to the lower part of the frame 1.

An elevating arm member 14, which is slidably fitted into an eccentric cam 13 fixed to a drive shaft 12, has its upper end pivoted to a rotating arm member 15 by a pin 16.

The rotating arm 15 is rotatably attached to the frame 1 by a pin 15P, and one end is pivoted to the lower end of the connecting rod 18 by a pin 17.

A bell crank 20 is rotatably attached to the frame 1 by a pin 21, with one arm pivoted to the upper end of the connecting rod 18 by a pin 19.

The other arm of the bell crank 20 is connected to the link 2 by a pin 24.
3, and the other end of the link 23 is connected to the upper end of the upper ram member 4 by a pin 22.

Therefore, the upper ram member 4 includes the link 23 and the bell crank 20.
, connecting rod 18, rotating arm 15, lifting arm 14, and eccentric cam 1
3 and is driven by a drive shaft 12.

The lower ram member 2 is connected to the die member 7 and the second ram member 2 is connected to the die member 7 as described above.
After being pushed down and stopped once in the stage process (Fig. 3c),
Furthermore, it is folded down one more time in the fourth step (Fig. 3e).

The former is a molding process, and the latter is a product extrusion process.

A bell crank 25 that presses down the lower ram member 2 in the product extrusion process is pivoted to the frame 1 by a pin 26, and one arm 27 having a fork portion is connected to the lower ram member 2.
It is engaged with an adjustable collar member 30 attached to the.

The bell crank 25 is engaged with a cam follower roller 28 attached to the other arm of the bell crank 25 or a drive cam member 29 attached to the drive shaft 12. Therefore, the rotation of the cam member 29 causes the bell crank 25 to reciprocate. to raise and lower the lower ram member 2.

A collar member 31 that determines the upper limit position of the lower ram member 2 is attached to the lower ram member 2 in an adjustable manner.

- As shown in Figure 5, the lower ram member 2 is used for powder compression.
A first bell crank 32 for pushing down is rotatably attached to the frame 1 by a pin 33.

As shown in FIGS. 1 and 3, the lower ram member 2 has a horizontal horizontal rod 35 fixed near its lower end.

A fork portion 34 is provided on one arm of the bell crank 32, and the fork 34 clamps the lower ram member 2 and has its lower surface in contact with a horizontal crossbar 35.

(Figures 5 and 6).

On the other hand, the horizontal horizontal rod 35 has both ends connected to the fluid 1 drive cylinder 42.
, 42' is connected to the piston rod 43°43',
A biasing force is constantly applied to the lower ram member 2 to push it upward (FIG. 1) 3. Therefore, the fork portion 34 of the bell crank 32 is always in contact with the horizontal transverse rod 35.

The other arm of the bell crank 32 is connected to the link 4 by a pin 36.
It is connected to the left end of 4a.

The right end of the link 44b, which is connected to the link 44a via the cylinder unit 41 described below, is connected to the pin 3.
9 on one arm of the second bell crank 37.

The bell crank 37 is rotatably attached to the frame 1 by a pin 38.

A cam follower roller 40 is attached to the other arm of the bell crank 37.
is attached, and a cam member 45 fixed to the drive shaft 12 has its outer peripheral surface engaged with the cam follower roller 40.

The feature of the present invention is that, as shown in FIG.
1 is attached.

As shown in FIGS. 7 and 8, the cylinder unit 41 is comprised of an adjustment mechanism 46 and a buffer mechanism 47.

The adjustment mechanism 46 is composed of a casing 48 and a sleeve member 49 that is rotatably mounted inside the casing and has a female thread that is threaded into a female thread carved on the outer periphery of the link 44a.

The sleeve member 49 is provided with a worm wheel 50 at its right end, and a worm 51 that is screwed into the worm wheel 50 is rotatably attached inside the casing 48 .

The worm member 51 has one end protruding from the casing 48 (FIG. 8).

As shown in FIG. 5, one end of a flexible shaft 52 is connected to the protruding end of the worm member 51, and the other end of the flexible shaft 52 is connected to an adjustment plate 53 attached to the frame 1.

Therefore, when an operator rotates the adjustment plate 53 using an appropriate wrench, the worm wheel 50 is rotated through the worm member 51 inside the casing 48 and the link 44a is rotated.
move in the axial direction.

That is, the link 44a is attached to the casing 48 so as to be expandable and retractable.

This means adjusting the distance d between the pivot pin 36 of the link 44a and the pivot pin 39 of the link 44b as desired.

As will be explained later, by adjusting this distance, the timing at which the lower ram member 2, and therefore the die member 7, descends during molding can be adjusted.

The buffer mechanism 47 includes a hydraulic cylinder 54 which is fastened to the casing 48 of the adjustment mechanism 46 by a bolt 66.
It consists of

The interior of the cylinder 54 having an end wall 57 is divided into three fluid chambers 58, 59, 60 by partition walls 55 and 56.

Each fluid chamber 58, 59, 60 has a piston 61,
62, 63 are slidably mounted and fluid supply pipes 64a, 64b connected to a suitable source of compressed fluid (not shown);
64c are each open, and furthermore, each fluid suction pipe 65a.

65b and 65c are connected.

Each piston 6162 and 63 is attached to link member 44b.

Normally, each fluid chamber 58, 59, 60 is connected to a compressed fluid source, so each piston 61, 6263 is pressed to the left and placed in the state shown in FIG.

However, if the load applied to the link 44a when the link 44b is pulled to the right by the drive of the cam 45 is excessive, it will overcome the compressed fluid pressure and cause each piston 6L6 to
2, 63 move to the right within each fluid chamber 58, 59, 60 to flexibly connect link 44a to link 44b without creating undue stress on link 44a.

As shown in Figures 2, 12 and 13, a support block 67 is attached to the lower end of the frame 1 on the center line of the lower ram member 2, which defines the lower limit of the movement of the lower ram member 2 that descends during the forming process.

The support block 67 is composed of a pair of mutually opposing links 68a and 68b pivoted to the lower end of the frame by pivot pins 69 and 71, respectively.
The shoulder portions 68S of a and 68b support the lower end of the lower ram member 2 (FIG. 13).

A pair of links 68a and 68b are interconnected by a connecting link 70, and a drive rod 72 is connected to link 68a by a pin 73.

Therefore, when the drive rod 72 is moved to the right in FIG.
and 71 in a clockwise direction, and the shoulder portions 6 of both
8S from the lower end of the lower ram member 2, and
This creates room for further decline.

As shown in FIG. 12, the right end of the drive rod 72 is connected to one arm of a bell crank 74 by a pin 78.

The bell crank 74 is rotatably attached to the frame 1 by a pin 17, and has a cam follower 75 attached to the end of the other arm.

The cam member 7b attached to the drive shaft 12 has its outer periphery in contact with the cam follower 75.

Therefore, by appropriately selecting the outer shape of the cam member 76, the pair of links 68a and 68b can be rotated clockwise or counterclockwise, respectively, as desired, to a position where the lower ram member 2 is prevented from descending, and a position where the lower ram member 2 is prevented from descending. It can be placed in any permissive position.

Fig. 14 shows various cam members attached to the drive shaft 12, from the right to the upper ram driving cam 13, the lower ram pushing down cam 45 during molding, and the lower ram pushing down cam when taking out the product. 29 and a cam 76 for opening and closing the support block.

FIG. 4 shows a curve in which the vertical axis represents the positions of the upper and lower ram members during operation of the powder compacting apparatus of the present invention, and the horizontal axis represents the rotation angle α of the drive shaft 12.

As shown in the figure, the upper ram member 4 starts its downward movement at the same time as the engine is started, continuously descends until it reaches the lower limit position, remains at the lower limit position for a while, and then continuously rises once and returns to the upper limit position.

After the lower ram member 2 starts operating, it is kept at the upper limit position for a while to fill the die member 7 with powder.

As the upper ram 4 descends, the upper punch 8 enters the stationary die member 7 and starts compressing the powder, and the first upper pressure stroke is performed.

When the upper part of the powder is compressed to some extent by the primary upper pressure,
The die member 7 and the upper punch 8 are connected by the lower pressure mechanism unique to the present invention.
and descend simultaneously, that is, the three curves descend almost parallel to each other, exerting a downward pressure on the powder.

When the density of the lower part of the powder increases due to the lower pressure and the friction on the die wall increases, the die stops descending, and only the upper punch pushes in, applying upper pressure.This process is repeated one after another, and the upper and lower pressures are increased. Performs the pressurization stroke while automatically maintaining balance.

As mentioned above, when the die and the upper punch 8 simultaneously descend and apply lower pressure to the powder, the density of the lower part of the powder increases, the friction on the die wall increases, and the descending of the die is stopped for a very short time, which causes the lower ram to be driven. Although the rotation of the bell crank 32 is also stopped, the cam member 45 on the drive shaft 12 still generates driving force, so a buffer mechanism 47 is required at the links 44a and 44b.

After the pressurizing stroke is completed, when the upper punch rises, the lower ram member (■) and the die member (■) tend to rise again due to the unbalanced force of the piston rods 43, 43' of the fluid drive cylinders 42, 42', causing the molded product to be lifted. It is necessary to hold the lower ram member (2) so that it will not be damaged.

Another reason why the buffer mechanism 47 is necessary is that the lower end of the lower ram member 2 comes into contact with the support block 67, preventing the lower ram driving bell crank 32 from rotating in the counterclockwise direction A (FIG. 5). This is because the driving force may be applied to the link 44b by the cam member 45 even at the same time.

As mentioned above, when installing the cylinder unit 41 of the present invention, the significant length of the links 44a and 44b, that is, the distance d from the center of the pivot pin 36 to the center of the pivot pin 39
can be adjusted via the adjusting plate 53, the flexible shaft 52, the worm member 51, and the worm 50, so the timing at which the die member 7 starts to descend can be adjusted.

That is, the position of the shoulder portion X of the descending curve of the die member 7 in FIG. 4 can be moved to the desired position X1.

For example, the most important part of a cemented carbide cutting tool such as an indexable tip is the upper corner of the cutting edge.3 By compressing the powder material in this part to a particularly high density, we can create products with high hardness in the required areas. It has gained.

The hardness of the product depends on the density of the powder.

On the other hand, as shown in FIG. 15, the curve of the pressurizing stroke of the punch member 8 or 6 and the pressurizing force almost forms a regular line, and the pressurizing force increases rapidly as the pressurizing stroke increases.

As mentioned above, the powder material is pressurized by the apparatus of the present invention in the following three ways.
(a) First stage, pressurization by the upper punch 8 (Fig. 3b) (
b) Second stage, pressurization by lower punch 6 (Fig. 3c) (c
) Third stage, pressurization by upper punch 8 (Fig. 3d) 1st stage.
The compression amounts of the second and third stages are yl, y2. y
3 and the total compression amount is Y, then Y=y1+y2+y3.

Since Y and y2 are approximately constant, y1+y3 is taken as a constant value.

Therefore, if yl is made smaller by selecting the lowering timing of the die member 7 as shown in FIG. 4, y3 becomes larger.

Therefore, by utilizing the portion of the curve in Fig. 15 where the compression stroke has a large value, it is easy to obtain a large value of △P by increasing y3.
This makes it possible to particularly increase the pressure on the upper surface.

The cylinder unit 41 of the present invention reduces yl and y
This is a device for increasing the number 3.

Since this makes it possible to apply pressure intensively to the top or bottom of the molded product, the device of the present invention has the advantage that the characteristics of the product can be easily controlled.

When the pressurizing stroke is completed, the upper punch rises, and as the main shaft 12 rotates, the bell crank 25 is actuated by the extrusion cam member 29, pushing down the lower ram directly connected to the die member and pushing the product into the third position.
e Place it in the extrusion position shown in the figure.

The feeder cup then moves forward and dispenses the molded product with its tip.

[Brief explanation of drawings]

FIG. 1 is a front view showing the device of the present invention, FIG. 2 is a side sectional view of the device of FIG. 1, and FIGS. 3a, 3b, and 3c. Figures 3d and 3c are diagrams showing the operating steps of the device in Figure 1;
Fig. 4 is a curve showing the operating position of the main parts of the device shown in Fig. 1, Fig. 5 is an enlarged side view showing the cylinder unit incorporated into the device shown in Fig. 1, and Fig. 6 is an enlarged side view of the device shown in Fig. 5. Plan view,
7 is an enlarged sectional view of the device shown in FIG. 5, FIG. 8 is a plan view of the device shown in FIG. 7, FIG. 9 is a sectional view taken along the line ■-■ in FIG. 7, and FIG. Figure 11 is an end view taken along line ■■-■■ in Figure 7. Figure 12 is an end view taken along line ■■-■■ in Figure 7.
13 is a plan view of the device shown in FIG. 12, FIG. 14 is a vertical sectional view of the device shown in FIG. 12,
FIG. 15 is a curve showing the relationship between the compression stroke of the punch and the compression force. 1...Frame, 2...Lower ram member,
3...Die set installation in space, 5...
・Lower punch support shoulder part of frame, 6... Lower punch, 7... Die member, 8... Upper punch, 9... Powder material, 10 ... Entire apparatus of the present invention, 11 ... Guide, 12 ...
・Drive shaft 13...Eccentric cam (for driving upper ram 1)
, 14... Elevating arm member, 15... Rotating arm, 16... Rotating pin, 17... Rotating pin, 18... ... Connection rod, 19 ... Rotating pin, 20 ... Bell crank, 21 ...
... Rotating pin, 22... Rotating pin, 23...
...Link, 24... Rotating pin, 25...
...Bell crank (for extrusion) 44a, 44b...
... Drive link, 45... Drive cam (for molding)
, 46...Adjustment mechanism, 47...Buffer mechanism, 48...Casing, 49...Sleeve with thread, 50...Warm ·foil,
51... Worm, 52... Flexible shaft,
53... Adjustment plate, 54... Buffer cylinder, 55... Bulkhead, 56... Bulkhead,
57...End plate, 58...Air chamber, 59
...Air chamber, 60...Air chamber, 61.
... Piston, 62 ... Piston, 63
... Piston, 64 ... Compressed air pipe,
65... Air intake pipe, 66... Bolt, 67... Support block, 68a, 68b...
... Link of support block, 26 ... Rotating pin, 27 ... Fork at the end of bell crank,
28...Cam follower, 29...Drive cam (for extrusion), 30...Adjustment collar, 31...
...adjustment collar, 32 ... push-down bell crank for molding, 33 ... rotation pin, 34 ...
...Bellcrank arm, 35...Horizontal transverse rod, 3
6... Rotating pin, 37... Bell crank, 38... Rotating pin, 39... Rotating pin, 40... Cam follower, 41...
Cylinder unit, 42... Hydraulic drive cylinder,
43... Piston rod of hydraulic 1 drive cylinder, 69...
... Rotating pin, 70 ... Connection link, 71
... Rotating pin, 72 ... Drive rod, 73
... Rotating pin, 74 ... Bell crank, 75 ... Cam follower, 76 ... Drive cam (for support block), 77 ... ... Rotating pin,
78... Rotating pin.

Claims (1)

[Claims] 1. A powder molding device comprising a frame having a support portion that holds a lower punch in an immovable position, and a lower ram member that is slidably attached to the frame and that raises and lowers a die member that fits into the lower punch, The frame includes a support block on the inner side of the lower end that defines the lower limit of the lower ram member, and the lower ram member is rotatably attached to the frame adjacent to the drive shaft of the forming device and has one arm connected to a cam on the drive shaft. The bell crank 37 is rotatably attached to the frame, and one arm is locked to the lower end of the lower ram member, and the other arm is connected to the bell crank 37 through the cylinder unit 41. The cylinder unit 41 has a drive mechanism consisting of a bell crank 32 connected to an arm opposite to one arm, and the cylinder unit 41 has an end on the piston side and an end on the cylinder side connected to a bell crank 37 and a bell crank 32, respectively. A telescoping adjustment link is connected to the bell crank 32 and connects both bell cranks in a cushioning manner via pressure oil in the cylinder, and is provided at the end of the cylinder unit 41 adjacent to the bell crank 32. 44a, the powder compacting device is connected to the other arm of the bell crank 32.