JPH09295196A - Powder molding press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure of a powder molding press, and to form an extremely thin formed article. SOLUTION: In the press completion condition, a pressing cylinder 57 fitted to a bracket 54 of an extrusion rod 52 to be lowered by a cam presses a beating rod 19 of a float plate 13, and the float plate 13 is not floated even when an upper punch 9 is elevated. The pressing cylinder 57 is prevented from being lowered by a stopping member 35. When the extrusion rod 52 is further lowered, a wedge 21 is pressed by an adjustment screw 58 of the bracket 54 to remove a slide block 20 from a stopper 30, and the float plate 13 is pressed to be lowered by a stepped part 21a, and a formed article M is extruded from a cavity.

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 pressurizing a metal powder or the like filled in a cavity into a predetermined shape.

[0002]

2. Description of the Related Art As a double-pressing type powder molding press,
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.In the pressure stroke, the compression cam lowers the die plate via the compression rod, and the upper punch is added. When the pressure is completed and rises, the anti-floating cam acts on the anti-floating cylinder to prevent the float plate from floating and the extruding cam moves the extruding rod to prevent the float plate from rising. After pushing down to release the fixation of the lower ram, lower the die plate together with the lower ram, release the fixation of the float plate with the extrusion screw to lower the float plate, and push the molded product upward from the cavity. Things are known (Japanese Patent Publication No. 4-42598).

[0003]

The above-mentioned conventional powder molding press requires three types of cams (compression cams, lift-up prevention cams, and extrusion cams) having different shapes, which makes the structure complicated and increases the cost. I'm 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 by a predetermined stroke or more, so that the molding of the flange of the molded product is restricted and the flange However, there is a problem that it is not possible to thinly form the like.

[0005]

In order to solve the above-mentioned problems, the powder molding press according to claim 1 has an upper punch attached to an upper ram which is vertically moved by rotation of a main shaft, and the upper punch. A die plate that includes a die that is inserted from the top to the bottom and that is vertically provided below the upper punch; and a first punch that is inserted into the die from the bottom to the top and is vertically provided below the die plate. And a base plate fixed to the frame below the float plate by inserting the float plate, the second punch into the first punch from the bottom to the top, and inserting the core rod into the second punch from the bottom to the top. In addition, in a powder molding press equipped with a lower ram that is connected to the die plate below the base plate, an extrusion rod that can move up and down in the axial direction, A pushing cylinder that pushes the float plate downward by the pushing portion by the lowering of the rod, and a float cylinder that pushes the push rod when the upper punch completes pressing and rises by rotating with the main shaft to lower the pushing rod. A cam is provided to prevent the plate from rising.

[0006] A slide block that abuts against the stopper to stop the float plate at the pressurization completion position, and a wedge that pushes down the push rod to lower the slide block from the stopper to lower the float plate. Can be attached. In this case, the base plate may be provided with a stop member for contacting the pressing portion of the pressing cylinder almost simultaneously with the contact of the slide block with the stopper.

Further, a stopper is attached to the lower ram to stop the lower ram at the pressurizing completion position by contacting with the fixing member, and a releasing means for removing the stopper from the fixing member after the pressurizing is completed on the pushing rod. It may have an attached structure. Furthermore,
A cushion cylinder may be attached to the pushing rod to push down the lower ram by the pushing portion to lower the pushing rod when the pushing rod is lowered during pressurization.

When the stopper is brought into contact with the fixing member, the pressing portion of the cushion cylinder is brought into contact with the frame at substantially the same time,
A stopper member for directly lowering the lower ram by the push rod may be provided.

Further, an upper punch attached to an upper ram that is moved up and down by rotation of a main shaft, and a die into which the upper punch is fitted from above to below are provided below the upper punch so as to be vertically movable. The first punch is fitted into the die from the bottom to the top, and the float plate is provided below the die plate so as to be vertically movable.
A base plate fixed to the frame below the float plate by being fitted into the punch from the bottom up,
In a powder molding press including a core rod inserted into the second punch from the bottom to the top and a lower ram provided below the base plate and connected to the die plate, a cam rotating with the main shaft and the cam. And a push-out rod for lowering the float plate and the lower ram to release the float plate and the lower ram when the pressurization is completed. You can

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described based on examples with reference to FIGS. In the figure, reference numeral 1
(Fig. 1) is the main axis. 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 arranged on the upper and lower parts of the frame 2. The upper ram 5 is connected to a crank mechanism 7 operated by the 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
Can move up and down. An upper punch 9 is attached to the 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 is provided with a die 16 (FIGS. 3, 4, and 5) into which the upper punch 9 is fitted from above to below,
It is fixed to the lower ram 6 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 has a die 16
The first punch 18 and the pressure receiving rod 1 which are fitted in the bottom from the top to the top.
9, a slide block 20 and a wedge 21, and a pair of cylinders 22, 22 on the base plate 14 (see FIG. 6).
Shows only one. ) Is supported up and down freely.

The first punch 18 is fixed to a fixed plate 23, and the fixed plate 23 is attached by an attaching member 26 to an adjusting member 25 screwed into a nut member 24 (FIGS. 3 and 7). The adjustment member 25 is stopped from rotating with a key 27,
When the nut member 24 is rotated by the worm 28, the nut member 24 moves up or down to change the insertion depth of the first punch 18 with respect to the die 16. The slide block 20 is
It contacts the stopper 30 provided on the base plate 14 to stop the float plate 13 at the pressurization completion position. When the wedge 21 descends, the roller 29 is pushed laterally to move outward and is removed from the stopper 30. Is attached to the lower surface of the float plate 13 so as to be slidable left and right.

Further, the base plate 14 is provided with a second punch 32 which is fitted into the first punch 18 from the bottom to the top, and is 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
The stop member 35 is fixed to the connecting member 36 by a plurality of connecting members 36 (FIG. 6). Pressure receiving rod 19 and wedge 21
And are inserted in the shaft hole of the stop member 35.

The lower ram 6 is provided with a core rod 37 and a stop 38 (FIG. 1). The upper end of the core rod 37 is fitted into the second punch 32 from the bottom to the top. The stopper 38 contacts the fixing member 39 to stop the lower ram 6 at the pressurization completion position, and is attached to the lower ram 6 by a pivot 40 so as to be vertically rotatable. The fixing member 39 has a screw structure and is vertically adjustable.

Upper ram 5, lower ram 6, die plate 1
2, the basic structure of the float plate 13, the base plate 14, etc. is well known.

Reference numeral 51 (FIG. 1) is a cam. The cams 51 are fixed to the main shaft 1 and provided on the left and right of the crank mechanism 7, respectively. Below each cam 51, an extruding rod 52 (FIG. 1, FIG. 2, FIG. 3) is axially supported by the frame 2 and vertically provided so as to be vertically movable 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 pushing rod 52. Further, the bracket 54 has a pressing portion 57 of the pressing cylinder 57 when the upper punch 9 completes pressing and moves up.
Push down the pressure receiving rod 19 with a and float plate 13
Of the slide block 20 is removed from the stopper 30 at an appropriate time after the lifting is prevented by pushing the wedge 21 downward with the adjusting screw (pushing portion) 58, and the float plate 13 is attached to the step 21a of the wedge 21. It is pushed down by and is lowered, and is fixed to the intermediate portion of the push rod 52. The adjusting screw 58 is vertically adjustable with respect to the bracket 54.

The pressing portion 57a of the pressing cylinder 57 is
Is set so that the slide block 20 comes into contact with the stopper 30 and comes into contact with the stop member 35 in a state where the descending of the float plate 13 is stopped.

The flange 55 is fixed to the push rod 52 below the bracket 54. Flange 5
The lower end of a rising spring 59 (FIG. 2), the upper end of which is attached to the frame 2, is attached to the upper surface of 5 to urge the pushing rod 52 upward. On the lower surface of the flange 55, cushion cylinders 63, 63 in which a tubular member (pushing 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 tubular member 62 is lowered together with the flange 55 and the like by the pushing rod 52, the upper punch 9 is slightly inserted into the die 16 and the pre-pressurization is started, and then 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 is provided with a stopper member 65.
(FIG. 1) is provided, and the stopper 38 is provided with a fixing member 39.
The cylindrical member 62 is abutted in the state of abutting against the to stop its descending.

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 a suitable time after the completion of pressurization, the stopper 38 is removed from the fixing member 39 to lower the ram 6.
Is pushed down by the pushing rod 52, and the long groove 66a formed at the lower end thereof is engaged with the pin 38a of the stopper 38. The powder molding press shown in the figure has a configuration in which 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 structure will be described mainly with reference to FIG. When the main shaft 1 rotates, the upper punch 9 and the pushing rod 52 are operated by the action of the pressing cylinder 7 and the cam 51.

That is, 0 when the upper punch 9 reaches the top dead center
The float plate 13 is raised to the uppermost position at the degree (rotation angle of the main shaft 1, the same applies hereinafter), 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 in the cavity as in the conventional case (see FIG. 3).

The upper punch 9 continues to descend, but the die plate 12 and the float plate 13 keep the elevated state. When the time elapses to reach about 128 degrees, the upper punch 9 is fitted into the die 16 and pre-pressurization is started. When the pressure reaches about 135 degrees in this way, the cylindrical member 62, which has been lowered together with the pushing rod 52 by the cam 51 shortly after 120 degrees, touches the pressure receiving rod 64 and pushes it, so that the die 16 is pressed by the die 16. Descend with plate 12 and core rod 37, and float plate 13 at about 140 degrees
The (first punch 18) is lowered by the force of the upper punch 9 through the powder W. In addition, during the operation without the powder W and the die (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 in synchronism with the upper punch 9.

At about 165 degrees, the float plate 1
3 stops the lowering by bringing the slide block 20 into contact with the stopper 30, and when it reaches 180 degrees, the die plate 1
When the stopper 2 abuts against the fixing member 39, the stopper 2 stops descending, the upper punch 9 reaches the bottom dead center, and the pressurization is completed (see FIG. 4).

The upper punch 9 begins to move up after passing through the bottom dead center, but the pressing portion 57a of the pressing cylinder 57 presses the pressure receiving rod 19 and the tubular member 62 presses the pressure receiving rod 64. Therefore, the die plate 12 does not move up following the upper punch 9.

At about 195 degrees, the cam 51 lowers the pushing rod 52 again. At this time, the pressing cylinder 57 and the cushion cylinder 63 in which the pressing portion 57a and the tubular member 62 are brought into contact with the stop member 35 and the stopper member 65 leak fluid such as oil to reduce the size. Rotation angle of main shaft 1 is about 2
At 18 degrees, the lever 66 rotates 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 move to the lower ram 6. Descend together. Again 240
The slide block 20 wedges the roller 29 into the wedge 2
1 sideways push to disengage from stopper 30, wedge 2
Since the stepped portion 21a of No. 1 pushes the float plate 13, the float plate 13 also descends. As the die plate 12 and the float plate 13 descend, the molded product M is pushed out of the cavity (see FIG. 5).

The above extruded state continues up to about 260 to 290 degrees, and after about 290 degrees, the die plate 12 and the float plate 13 rise by the action of the cylinders 8 and 22 which are forcibly compressed by their descending. To start.
Hereinafter, the above cycle is repeated.

FIG. 8 merely shows an example of the operation timing of the upper punch 9, the die plate 12, the float plate 13 and the like, and various types of shapes corresponding to the shape of the molded product M, the type of the powder W, etc. Needless to say that it will be changed to.

The embodiment shown in the drawing is a case of a high-speed press having a shallow forming depth, a high forming speed of the press (for example, 40 rpm). Deep filling depth (for example, 100-150m
The present invention can be applied to a press having a low molding speed (for example, 6 to 24 rpm) and 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 this case, air is sent to the cylinder 22 through the solenoid valve to balance the air and prevent the float plate 13 from rising.

In addition to the crank press shown in the figure for driving the ram by the crank mechanism, the present invention also drives the ram by the eccentric press, the knuckle press for driving the ram by the toggle joint, and the ram by the cam mechanism. It can also be applied to a cam press or the like. It is also possible to add one or more float plates equipped with punches and insert those punches between the second punch 32 and the core rod 37 to carry out.

[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 the top to the bottom. A die plate that includes a die and is vertically provided below the upper punch; a float plate that is vertically inserted below the die plate by inserting the first punch into the die from the bottom to the second; A base plate fixedly provided on the frame below the float plate by inserting the punch into the first punch from the bottom to the top, and a core rod into the second punch from the bottom to the top and below the base plate. In a powder molding press equipped with a lower ram provided to be connected to the die plate, an extruding rod that is vertically movable in an axial direction, and The pressing cylinder that presses the float plate downward with the pressing portion and the float plate that floats with the pressing cylinder when the upper punch completes pressing and rises by rotating with the main shaft and lowering the extrusion rod. Since it is configured with a cam that prevents the float, the float plate can be prevented from rising with a simple structure, unlike the conventional one in which the lift prevention cylinder is operated by a dedicated cam. Moreover, the cam and the pushing rod can be used for various purposes.

A slide block that abuts against the stopper and stops the float plate at the pressurization completion position, and a wedge that pushes down by the pushing rod and lowers the slide block from the stopper to lower the float plate. With the structure additionally provided, since the cam and the pushing 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, and therefore it is possible to form an extremely thin molded product without any trouble.

Further, in the case where the base plate is provided with a stop member for contacting the pressing portion of the pressing cylinder almost simultaneously with the contact of the slide block with the stopper, the lowering of the float plate in the pushing stroke affects the pressing cylinder. It can be controlled correctly without being affected.

Further, a stopper is attached to the lower ram to abut the fixing member to stop the lower ram at the pressurization completion position, and the pushing rod is provided with a releasing means for removing the stopper from the fixing member after the pressurization is completed. With the attached structure, the cam and the pushing 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 that pushes down the lower ram at the push-down portion when the push rod descends when pressure is applied, the cam and push rod are also used for pushing down the die plate. Because it is done
Furthermore, the structure is simplified.

Further, in the case where the frame is provided with a stopper member for bringing the pressing portion of the cushion cylinder into contact with the fixing member almost simultaneously with the contact of the fixing member and directly lowering the lower ram by the pushing rod, when the pushing member is provided, It is possible to correctly control the lowering of the die plate during the stroke without being influenced by the cushion cylinder.

Furthermore, an upper punch attached to an upper ram which is moved up and down by the rotation of the main shaft, and a die into which the upper punch is fitted from the top to the bottom are provided so as to be vertically movable below the upper punch. A plate, a float plate vertically inserted below the die plate by inserting the first punch into the die from the bottom, and a second punch inserted into the first punch from the bottom to the top. A base plate fixed to the frame below the float plate, and a lower ram provided by inserting the core rod into the second punch from the bottom to the top and being connected to the die plate below the base plate. In the powder molding press described above, the cam rotating with the main shaft is lowered by the cam, and the float plate is lowered during pressurization. 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 type of cams and push rods are in time, so the structure is simple and the cost is low.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example 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 pressurization completed state.

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

FIG. 6 is a view showing a support state of a float plate by a cylinder and the like.

FIG. 7 is a cross-sectional view showing a relationship between an adjusting member and 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]

 1 Spindle 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 Stop Member 37 Core Rod 38 Stopper 39 Fixing Member 51 Cam 52 Push-out rod 57 Pressing cylinder 57a Pressing part 62 Cylindrical member (pressing part) 63 Cushion cylinder 65 Stopper member 66 Lever (release means)

Claims (7)

[Claims] 1. A die plate provided with an upper punch attached to an upper ram that is vertically moved by the rotation of a main shaft, and a die into which the upper punch is fitted from above to below and vertically provided below the upper punch. And a float plate vertically inserted below the die plate by inserting the first punch into the die from the bottom to the top, and by inserting the second punch into the first punch from the bottom to the top. A base plate fixed to the frame below the plate; and a lower ram inserted into the second punch from the bottom to the bottom and connected to the die plate below the base plate. In a powder molding press, an extruding rod that can move up and down in an axial direction, and a pressing sill that presses the float plate downward by a pressing portion by lowering the extruding rod. And a cam that rotates together with the main shaft to lower the extrusion rod to prevent the float plate from rising by the pressing cylinder when the upper punch completes pressurization and rises. And a powder molding press. 2. The float plate has a slide block which abuts against a stopper to stop the float plate at a pressurization completion position, and a push rod which pushes down the slide block to remove the slide block from the stopper and lower the float plate. The powder molding press according to claim 1, further comprising a wedge to be attached. 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 with the slide block substantially simultaneously with contact with the stopper. 4. The lower ram is provided with a stopper for abutting against the fixing member to stop the lower ram at the pressurizing completion position, and the push-out rod releases the stopper from the fixing member after the pressurizing is completed. A means is additionally provided.
The powder molding press according to 2 or 3. 5. The extruding rod is provided with a cushion cylinder for pushing down the lower ram at the pressing portion to lower the extruding rod when the extruding rod descends during pressurization. Powder molding press. 6. The frame is provided with a stopper member which causes a push-down portion of a cushion cylinder to come into contact with the fixing member almost at the same time when a stop member comes into contact with the fixing member, and lowers a lower ram directly by an extruding rod. The powder molding press according to claim 5. 7. A die plate provided with an upper punch attached to an upper ram that is moved up and down by the rotation of a main shaft, and a die into which the upper punch is inserted from above to below and vertically provided below the upper punch. And a float plate vertically inserted below the die plate by inserting the first punch into the die from the bottom to the top, and by inserting the second punch into the first punch from the bottom to the top. A base plate fixed to the frame below the plate; and a lower ram inserted into the second punch from the bottom to the bottom and connected to the die plate below the base plate. In a powder molding press, a cam that rotates with the main shaft and a cam that is lowered by the cam lowers the float plate when pressurizing, and when the pressurizing is completed. A powder molding press, characterized in that an extruding rod for releasing the fixation of the float plate and the lower ram to lower the float plate and the lower ram is provided.